A retailer sold three products X, Y, and Z with selling prices in the ratio 3:5:7. He incurred a 12% loss on X, a 40% profit on Y, and broke even on Z. What was his overall profit or loss percentage?

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1. Let the selling prices be $3k,5k,7k$. So total SP = $15k$.  
2. Compute costs: $CP_X=\dfrac{3k}{0.88}=\dfrac{75k}{22}$, $CP_Y=\dfrac{5k}{1.4}=\dfrac{25k}{7}$, $CP_Z=7k$.  
3. Total CP = $\dfrac{75k}{22}+\dfrac{25k}{7}+7k=\dfrac{2153k}{154}$.  
4. Profit = $15k-\dfrac{2153k}{154}=\dfrac{157k}{154}$. Profit% = $\dfrac{157}{2153}	imes100\approx7.29\%$. Thus a profit of 7.29%.  
FINAL_ANSWER: b

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